NAME

       Data::Dump - Pretty printing of data structures

SYNOPSIS

        use Data::Dump qw(dump);

        $str = dump(@list);
        @copy_of_list = eval $str;

        # or use it for easy debug printout
        use Data::Dump; dd localtime;

DESCRIPTION

       This module provides a few functions that traverse their argument list and return a string containing
       Perl code that, when "eval"ed, produces a deep copy of the original arguments.

       The main feature of the module is that it strives to produce output that is easy to read.  Example:

           @a = (1, [2, 3], {4 => 5});
           dump(@a);

       Produces:

           "(1, [2, 3], { 4 => 5 })"

       If you dump just a little data, it is output on a single line. If you dump data that is more complex or
       there is a lot of it, line breaks are automatically added to keep it easy to read.

       The following functions are provided (only the dd* functions are exported by default):

       dump( ... )
       pp( ... )
           Returns  a  string  containing  a Perl expression.  If you pass this string to Perl's built-in eval()
           function it should return a copy of the arguments you passed to dump().

           If you call the function with multiple arguments then the output will be wrapped  in  parenthesis  "(
           ...,  ... )".  If you call the function with a single argument the output will not have the wrapping.
           If you call the function with a single scalar (non-reference) argument it will just return the scalar
           quoted if needed, but never break it  into  multiple  lines.   If  you  pass  multiple  arguments  or
           references  to  arrays  of  hashes  then  the return value might contain line breaks to format it for
           easier reading.  The returned string will never be "\n" terminated, even if contains multiple  lines.
           This allows code like this to place the semicolon in the expected place:

              print '$obj = ', dump($obj), ";\n";

           If  dump()  is  called  in void context, then the dump is printed on STDERR and then "\n" terminated.
           You might find this useful for quick debug  printouts,  but  the  dd*()  functions  might  be  better
           alternatives for this.

           There  is  no  difference  between dump() and pp(), except that dump() shares its name with a not-so-
           useful perl builtin.  Because of this some might want to avoid using that name.

       quote( $string )
           Returns a quoted version of the provided string.

           It differs from "dump($string)" in that it will quote even numbers and not try to come up with clever
           expressions that might shorten the output.  If a non-scalar  argument  is  provided  then  it's  just
           stringified instead of traversed.

       dd( ... )
       ddx( ... )
           These functions will call dump() on their argument and print the result to STDOUT (actually, it's the
           currently selected output handle, but STDOUT is the default for that).

           The difference between them is only that ddx() will prefix the lines it prints with "# " and mark the
           first  line  with the file and line number where it was called.  This is meant to be useful for debug
           printouts of state within programs.

       dumpf( ..., \&filter )
           Short hand for calling the dump_filtered() function of Data::Dump::Filtered.  This works like dump(),
           but the last argument should be a filter callback  function.   As  objects  are  visited  the  filter
           callback is invoked and it can modify how the objects are dumped.

CONFIGURATION

       There  are  a  few global variables that can be set to modify the output generated by the dump functions.
       It's wise to localize the setting of these.

       $Data::Dump::INDENT
           This holds the string that's used for indenting multiline data structures.  It's default value  is  "
           "  (two  spaces).   Set  it to "" to suppress indentation.  Setting it to "| " makes for nice visuals
           even if the dump output then fails to be valid Perl.

       $Data::Dump::TRY_BASE64
           How long must a binary string be before we try to use the base64 encoding for the dump  output.   The
           default is 50.  Set it to 0 to disable base64 dumps.

       $Data::Dump::LINEWIDTH
           This controls how wide the string should before we add a line break.  The default is 60.

LIMITATIONS

       Code  references  will  be  dumped as "sub { ... }". Thus, "eval"ing them will not reproduce the original
       routine.  The "..."-operator used will also require perl-5.12 or better to be evaled.

       If you forget to explicitly import the "dump" function, your code will core dump. That's because you just
       called the builtin "dump" function by accident, which intentionally dumps core.  Because of this you  can
       also import the same function as "pp", mnemonic for "pretty-print".

HISTORY

       The  "Data::Dump"  module  grew out of frustration with Sarathy's in-most-cases-excellent "Data::Dumper".
       Basic ideas and some code are shared with Sarathy's module.

       The "Data::Dump" module provides a much simpler  interface  than  "Data::Dumper".   No  OO  interface  is
       available  and  there are fewer configuration options to worry about.  The other benefit is that the dump
       produced does not try to set any variables.  It only returns what is needed to  produce  a  copy  of  the
       arguments.  This means that "dump("foo")" simply returns '"foo"', and "dump(1..3)" simply returns '(1, 2,
       3)'.

SEE ALSO

       Data::Dump::Filtered, Data::Dump::Trace, Data::Dumper, JSON, Storable

AUTHORS

       The  "Data::Dump"  module  is  written  by  Gisle Aas <gisle@aas.no>, based on "Data::Dumper" by Gurusamy
       Sarathy <gsar@umich.edu>.

        Copyright 1998-2010 Gisle Aas.
        Copyright 1996-1998 Gurusamy Sarathy.

       This distribution is currenly maintained by Breno G. de Oliveira.

       This library is free software; you can redistribute it and/or modify it under  the  same  terms  as  Perl
       itself.

perl v5.32.1                                       2021-09-26                                    Data::Dump(3pm)